Lorenzo b



(N Model.)

L. B. FAVOR.

MULTIPLE PUSE BLoGK. No. 452,8'75. atented May 26,1891.

WITNESSES: INVENTOR nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn c.

UNITED STATES PATENT OFFICE.

LORENZO B. FAVOR, OF GLOUCESTER, MASSACHUSETTS, ASSIGNOR TO THE i THERMAL ELECTRIC COMPANY, OF SAME PLAOE. i

MULTIPLE FUSE-BLOCK.

SPECIFICATION forming part of Letters Patent No. 452,8'75, dated May 26, 1891.

Application filed November 3, 1890. Serial No, 370,098. (No model.)

To all whom it may concern:

Be it known that I, LORENZO B. FAVOR, a citizen of the United States, residing at Gloucester, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in rl`hermal Out- Outs-Electricalg and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has reference to certain new and useful improvements in the construction of devices known as thermal cut-outs, and

has for its object to improve upon the construction shown and described in Letters Patent No. 431,186, issued to me July 1, 1890.

The aceomp-anying drawing shows a plan view of my improvement.

A is a base made from any suitable nonconducting material, and B is a conductingbar secured to said base and electrieally connected with one of the line-wire bindingposts C.

D is a spring-actuated finger pivoted on the base and electrieally connected with the other line-wire binding-post E. The spring action is imparted to the finger by means of a volute Spring F, one end ef which is secured to the finger, as seen at a, the other end engaging a pin b, projecting` from the base A.

G are contact-dogs pivoted independent of each other to the base and Whose noses extend normally in the arc of a circle for the purpose presently explained.

H are fusible plugs inserted within holes in the base and composed of some such material as spermaceti, parafine, or. sealing-Wax, that fuses readily at from 120O to 136o Fahrenheit.

I are binding-screws on the bar B. The tails of the dogs G are connected to the binding-screws Iby wires J, which latter are given a turn around the plugs H and fastened at a tension to the bar B by means of said screws. The tension of the wires holds the degs in a position to afford resistance to the Spring-iinger, as shown in the instance of the iive dogs Mat the left of the drawing.

When a current of an intensity of at least siXty-five one-hundredths of an ampere gets in' the circuit, Whether from lightning, electric-lighting wires, or otherwise, the plug in ci rcuit will fuse, and the wire around the same will become slack and will no longer afford a resistance to the finger. The latter will therefore swin g against the next dog and close the circuit. In the instance of the tension- Wire at the right of the drawing I have shown the effect cansed by the fusing of the plug.

Frequently, and in fact usually, the finger will pass by the dog` before the plug has fused entirely through; but it sometimes happens that the plug is entirely cut off by the contraction of the wire when heated by the electrie current.

In my above-mentioned patented improvement I employ fusible wires, but their Strength is so little that they frequently become broken aecidentally, and moreover the substitution of new wires for those that have become broken or fused is a delicate and somewhat tedious Operation.

In my present application the wires are not fusible, but are strong enough to stand usage Without breaking, and in re-establishing a fused connection it is merely necessary to substitute new plugs for those that have been fused.

Of course it will be seen that my invention resides in the broad idea of keeping the degs in a normal position to bar. the progress of the finger by means of wires drawn at a tension and fu sible plugs against which said tension is exerted, and therefore it is not necessary that the exact relative position of the plugs and wires shown should be preserved, since the purpose and result of my invention will be subserved as long as the plug is interposed as a resistance to the tensile strain go of the wire.

l cla-in1-- 1. In a thermal cut-out, the combination, with the spring-actuated finger and the conductor-bar insulated from each other and electrically connected with the respective ends of the line-wire, of the pivoted contact-degs insulated from each other, the tension-wires connecting said degs with the said bar, and fusible plugs of paraffine, spermaceti, or the :oo like interposed as a resistance to the tension of said wires, substantially as set forth.

2. In a thermal out-out, the combination Secured atatension to said dogs and Conductof the non-conducting base, the Spring-actuor-bai', snbstantially as shown and described. ro ated finger, and the conductor-bai` Secured to 1 In testimony Whereof Iaffix my signaturein said base and electricaily connected to the presence of two Witnesses.

5 respective ends of the line-Wire, the contact` LORENZO B. FAVOR.

dogs pivoted independently to said base, the Wtnesses: fnsible plugs pi'ojectng from said base, and BENJ. II. CORLISS, J 1'.,

the non-fusible wires around said piugs and RICHARD IO. STEELE. 

